major CSS problems with MacIE5

I'm having some major issues with Cascading Style Sheets on Mac IE5. The page layout looks horrendous, with huge gaps between text, text that moves around when it shouldn't and other truly bizarre occurances. As an example, look at this page:

using MacIE5. You'll notice that when you mouse over any of the purple navigation buttons across the top (Heard on the green, facts, etc.) that the text in the body of the page moves down the screen. Neat trick, but not what I want. (And there aren't even any mouseover or onclick events defined for those nav buttons)